MadWifi理解笔记091124

 

关于在MadWifi速率控制算法中获得RSSI

 

以SampleRate算法代码为例：

 

in function:  static void ath_rate_tx_complete(struct ath_softc *sc,  struct ath_node *an, const struct ath_buf *bf)

 

const struct ath_tx_status *ts = &bf->bf_dsstatus.ds_txstat;

 

Then the RSSI is : ts->ts_rssi.

 

 

---

 

 

 

struct ath_buf {/* FFXXX: convert both list types to TAILQ to save a field? */STAILQ_ENTRY(ath_buf) bf_list;#ifdef ATH_SUPERG_FFTAILQ_ENTRY(ath_buf) bf_stagelist;/* fast-frame staging list */#endifstruct ath_desc*bf_desc;/* virtual addr of desc */struct ath_desc_status bf_dsstatus;/* tx/rx descriptor status */dma_addr_t bf_daddr;/* physical addr of desc */struct sk_buff *bf_skb;/* skbuff for buf */dma_addr_t bf_skbaddr;/* physical addr of skb data - always used by one desc */u_int32_t bf_status;/* status flags */u_int16_t bf_flags;/* tx descriptor flags */u_int64_t bf_tsf;int16_t bf_channoise;#ifdef ATH_SUPERG_FF/* XXX: combine this with bf_skbaddr if it ever changes to accommodate * multiple segments. */u_int16_t bf_numdescff;/* number of descs used for FF (these are extra) */u_int32_t bf_queueage;/* "age" of txq when this buffer placed on stageq */dma_addr_t bf_skbaddrff[ATH_TXDESC - 1]; /* extra addrs for FF */#endifint bf_taken_at_line; /* XXX: Want full alloc backtrace */const char *bf_taken_at_func;};

 

 

struct ath_desc_status {union {struct ath_tx_status tx;/* xmit status */struct ath_rx_status rx;/* recv status */} ds_us;};#defineds_txstatds_us.tx#defineds_rxstatds_us.rx

 

struct ath_tx_status {u_int16_tts_seqnum;/* h/w assigned sequence number */u_int16_tts_tstamp;/* h/w assigned timestamp */u_int8_tts_status;/* frame status, 0 => xmit ok */u_int8_tts_rate;/* h/w transmit rate index */#defineHAL_TXSTAT_ALTRATE0x80/* alternate xmit rate used */int8_tts_rssi;/* tx ack RSSI */u_int8_tts_shortretry;/* # short retries */u_int8_tts_longretry;/* # long retries */u_int8_tts_virtcol;/* virtual collision count */u_int8_tts_antenna;/* antenna information */u_int8_tts_finaltsi;/* final transmit series index */#ifdef AH_SUPPORT_AR5416/* 802.11n status */u_int8_t ts_flags; /* misc flags */int8_t ts_rssi_ctl[3];/* tx ack RSSI [ctl, chain 0-2] */int8_t ts_rssi_ext[3];/* tx ack RSSI [ext, chain 0-2] *//* #define ts_rssi ts_rssi_combined */u_int32_t ts_ba_low;/* blockack bitmap low */u_int32_t ts_ba_high;/* blockack bitmap high */u_int32_t ts_evm0;/* evm bytes */u_int32_t ts_evm1;u_int32_t ts_evm2;#endif /* AH_SUPPORT_AR5416 */};